[ARC5] Headset adapters MC-385-B and MC-385-C

[Brian Clarke]

If you still want one of these headset audio transformers, I have a few available on eBay presently, as item #255149764269, some still in their original manufacturer’s packaging. In case you missed my earlier response to Bob, here is the result of some frequency response testing I did:

I have tested this transformer into a suitable load. The frequency response is flat from 15 Hz to 10 kHz, only down 1.4 dB at 20 kHz; the upper -3 dB point is at 33 kHz. Consequently, this transformer could easily be considered Hi-Fi. So, you could use this transformer to provide Galvanic isolation for your low-impedance headphones from a Hi-Fi amplifier.

I also have available, same place, same era, an inline headphone audio transformer, C-410 as item #255150991225.

You can trade through eBay, or you can deal with me directly, say, if you want several.

73 de Brian, VK2GCE

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Bob Groh
Sent: Monday, 27 September 2021 11:15 PM
To: Craig
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Headset adapters MC-385-B and MC-385-C

 

The headset impedance converters are SOLD.  Many thanks to all who responded and helped me find a good home for them.  The things we pickup over the years!!!

 

73

Bob Groh, WA2CKY

"... whose junk box is just a little bit more empty...."

 

On Mon, Sep 27, 2021 at 8:08 AM Craig via ARC5 <arc5 at mailman.qth.net> wrote:

Bob: If no one has spoken up yet, I'm interested in them.  Shoot me a direct email and we'll arrange things.

Craig

KF5JOT

On 9/26/21 5:23 PM, Bob Groh wrote:

Cleaning up the ham shack and found these two items - would like to find a home for them so I don't do something stupid like taking them apart for the parts. These are apparently nothing more than impedance converters for headphones (e.g. HS-33). Order number on one is "148-DAY-44" which  I assume that the original order was written at the tail end of WW II. Just cover the postage ($8??) plus a couple of bucks and I will be a delighted ham.

 

Bob Groh, WA2CKY 

 

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